Mitel SX-200 EL Technician's Handbook page 17

Connectivity from the Main Control Cabinet
The following cards with an interface module connect the main control
cabinet to the peripheral bays. The Control FIM Carrier cards support
fiber connectivity.The Control Triple CIM card and the PRI card support
copper and fiber connectivity.
Control Dual FIM Carrier card - allows the fiber connection of up to
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two peripheral bays
Control Triple FIM Carrier card - allows the fiber connection of up to
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three peripheral bays
Control Triple CIM card - allows the copper connection of up to three
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peripheral bays; a copper connection may be substituted with a fiber
connection
PRI card - allows the fiber or copper connection of one peripheral
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bay
You can have either two or three links to each peripheral bay:
With a MCC IIIEL / ELx control card, the Control Dual FIM Carrier
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card provides three links per peripheral bay
With a MCC IIIEL control card, the Control Triple FIM Carrier card or
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the Control Triple CIM card (set to dual interface) provides two links
per peripheral bay
With a MCC IIIELx control card (installed in a SX-200 ELx cabinet
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PN 9109-600-002-NA), the Control Triple FIM Carrier card and the
Control Triple CIM card (set to triple interface) provide three links per
peripheral bay
If you provide two links to each bay:
Calls must be evenly distributed across all bays
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Maximum channel blocking ratio is 0.58.
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Introduction
7